Lock and Dam No. 21
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| Lock and Dam No. 21 | |
 Mississippi River Lock and Dam number 21 |
|
| Impounds | Upper Mississippi River |
|---|---|
| Creates | Pool 21 |
| Maintained by | United States Army Corps of Engineers |
| Length | 1,265 feet (385.6 m) (movable portion) |
| Construction began | 1933 |
| Opening date | July 23, 1938 |
| Geographical Data | |
| Coordinates | |
Lock and Dam No. 21 is a lock and dam located near Quincy, Illinois on the Upper Mississippi River around river mile 324.9. The movable portion of the dam is 1,265 feet (385.6 m) long and consists of three roller gates and ten tainter gates. A 1,400 feet (426.7 m) long submersible dike continues to the Missouri shore. The main lock is 110 feet (33.5 m) wide by 600 feet (182.9 m) long there is also an incomplete auxiliary lock. In 2004, the facility was listed in the National Register of Historic Places as Lock and Dam No. 21 Historic District, #04000181 covering 1,075 acres (4.4 km²), 1 building, 4 structures, 4 objects.
[edit] External links
| Locks and dams of the Upper Mississippi River | |
|---|---|
| USAF • LSAF • 1 • 2 • 3 • 4 • 5 • 5A • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 24 • 25 • 26 • 27 | |
| Upstream: Lock and Dam No. 20 |
Downstream: Lock and Dam No. 22 |
